上世纪40年代,苏联克格勃因为密码泄露,招致了苏联谍报工作史上最著名的“剑桥五杰”暴露、原子弹间谍网被美国破获的惨痛教训。1927年以来,克格勃为了防止密码被截获和破译,抛弃了易被窃听和截获的无线电通讯方式,严格规定内外联络和传递情报必须经由苏联外交人民委员部进行,特别是与驻外间谍机关进行密码通信时,使用了一套非常可靠的密码本系统。总部机关在 The 40s of last century, the Soviet Union KGB leaked because of the password, led to the history of the Soviet Union espionage work in the history of the most famous “Cambridge Five Jie” exposure, the atomic bomb spy network was bitter lessons learned by the United States. Since 1927, in order to prevent the password from being intercepted and deciphered, the KGB has abandoned the radio communication methods that are easily intercepted and intercepted. The strict stipulation that the internal and external liaison and transmission of information must be conducted through the Soviet Diplomatic People’s Commission, especially with the spy agencies abroad Communication, the use of a very reliable password system. Headquarters in the